Backport of weakref.WeakSet and tests from Python 3.
diff --git a/Misc/NEWS b/Misc/NEWS
index e8fc0b0..7855dd5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -37,6 +37,8 @@
True/False. This makes Fraction <=> complex comparisons consistent with
int <=> complex, float <=> complex, and complex <=> complex comparisons.
+- Addition of ``WeakSet`` to the ``weakref`` module.
+
- logging: Added LOG_FTP to SysLogHandler and updated documentation.
- Issue #8205: Remove the "Modules" directory from sys.path when Python is